163706022881281 has 4 divisors (see below), whose sum is σ = 163708177295700. Its totient is φ = 163703868466864.

The previous prime is 163706022881279. The next prime is 163706022881287. The reversal of 163706022881281 is 182188220607361.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 62038307073600 + 101667715807681 = 7876440^2 + 10083041^2 .

It is a cyclic number.

It is not a de Polignac number, because 163706022881281 - 2¹ = 163706022881279 is a prime.

It is a super-3 number, since 3×163706022881281³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163706022881287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1077093226 + ... + 1077245203.

It is an arithmetic number, because the mean of its divisors is an integer number (40927044323925).

Almost surely, 2^{163706022881281} is an apocalyptic number.

It is an amenable number.

163706022881281 is a deficient number, since it is larger than the sum of its proper divisors (2154414419).

163706022881281 is an equidigital number, since it uses as much as digits as its factorization.

163706022881281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2154414418.

The product of its (nonzero) digits is 3096576, while the sum is 55.

The spelling of 163706022881281 in words is "one hundred sixty-three trillion, seven hundred six billion, twenty-two million, eight hundred eighty-one thousand, two hundred eighty-one".